a class that looks like (kind_of?) several classes

[Eric Mahurin]

Is there a way to make a class that looks like several classes?
For example:

class IOArray < IO
include Array # doesn't work because Array is not a Module
# use IO methods calls to accomplish the Array methods
end

I don't need multiple inheritance. All I want is these
additional classes to appear in the ancestors list. In the
above example, IOArray could act like an IO or an Array. It
looks like evil.rb might have a solution, but is there a
non-evil way?




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[Robert Klemme]

Is there a way to make a class that looks like several classes?
For example:

class IOArray < IO
include Array # doesn't work because Array is not a Module
# use IO methods calls to accomplish the Array methods
end

I don't need multiple inheritance. All I want is these
additional classes to appear in the ancestors list. In the
above example, IOArray could act like an IO or an Array. It
looks like evil.rb might have a solution, but is there a
non-evil way?

class IOArray < IO
def kind_of?(cl)
Array == cl || super
end
end
=> true

But seriously, for what do you need that? I can't think of an application
where I would want to make something look like an Array without being one.
Maybe it's rather Enumerable that you want?

Kind regards

robert